Fifty-one percent of eighth graders nationwide felt that their civics classes were too easy, and 29 percent felt math classes were often or always not challenging.

When it came to reading, one-third of eighth graders reported reading five pages or less during the school day and for homework combined.

And the lack of rigorous curriculum seems to continue into high school, with 28 percent of high school seniors reporting they are rarely required to write long-form answers on tests, and 21 percent saying math was too easy.

The Center for American Progress noted that many students also don't have access to engineering and technology classes, which could set them back from competing in the global market.